CN107968310A - The unstable observation device and method of pattern in optical fiber laser based on backward light echo - Google Patents
The unstable observation device and method of pattern in optical fiber laser based on backward light echo Download PDFInfo
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- CN107968310A CN107968310A CN201711090331.9A CN201711090331A CN107968310A CN 107968310 A CN107968310 A CN 107968310A CN 201711090331 A CN201711090331 A CN 201711090331A CN 107968310 A CN107968310 A CN 107968310A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06716—Fibre compositions or doping with active elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The invention discloses the unstable observation device and method of pattern, device in a kind of optical fiber laser based on backward light echo to include：Optical fiber laser, including semiconductor laser, optical-fiber bundling device, high reflectance grating, active Yb dosed optical fiber, antiradar reflectivity coupling output grating, Cladding Power Stripper, end caps, the signal arm input optical fibre distal end faces of optical-fiber bundling device cut to form inclined-plane；Signal processing mechanism, it includes photodetector and oscillograph；Method includes obtaining retroeflection optical signal, retroeflection optical signal is converted to electric signal and picture signal successively, judging optical fiber laser according to picture signal, whether emergence pattern is unstable.The present invention uses all optical fibre structure, its sensitivity to external mechanical vibrations is smaller, laser is all transmitted except output in fibre-optic waveguide, additional space coupled apparatus is not required in it, reduce the complexity and danger of observation, and observed using the relatively low retroreflection light of retroeflection power, it is easy to adjust, degree of danger is low.
Description
Technical field
The present invention relates to high-capacity optical fiber laser technical field, swashs more particularly, to a kind of optical fiber based on backward light echo
The unstable observation device and method of pattern in light device.
Background technology
Pattern in optical fiber laser is unstable to be referred to after optical fiber laser output power exceedes a certain specific threshold value,
The output mode of optical-fiber laser can carry the random change significantly with time correlation, be mainly shown as high-order mode power Components
Sharply increase and be accompanied by the quick oscillation of output mode component, and the severe exacerbation of output beam quality can be caused.Therefore, it is right
Pattern wild effect in optical fiber laser is observed and is judged and try to suppress, for the normal fortune of optical fiber laser
Turn important in inhibiting.
At present, be mostly in the form of photodetector and oscillograph combine observation and the unstable effect of determinating mode whether
Occur, its principle is：The unstable effect of pattern is vibrated with the violent of output optical signal, by the optical-electronic of photodetector
After signal conversion, obtained electric signal necessarily can also carry violent vibration, it can produce obvious vibration letter on oscillograph
Number, when occurring without the unstable effect of pattern, since signal does not vibrate, turn by the electro-optical signal of photodetector
The electric signal obtained after changing is the direct current signal not vibrated, therefore can determine whether mould according to the signal shape shown on oscillograph
Whether the unstable effect of formula occurs.
Based on above-mentioned principle, document 1 (M.M.Johansen, M.Laurila, M.D.Maack, D.Noordegraaf,
C.Jakobsen, T.T.Alkeskjold, J.Lagsgaard, " Frequency resolved transverse mode
Instability in rod fiber amplifiers " Optic Express, 2,013 21 (19), 21847-21856) in
A kind of unstable observational technique of lasing mode is disclosed, it mainly swashs the optical fiber of the rod-like structure optical fiber of Space Coupling
Light device after it is divided by a dichroscope, furnishes one point again into the measurement of the unstable effect of row mode before power meter
Light device, a small amount of light beam separated are measured by entering photodetector after neutral density attenuator and aperture, and this method is not only
It is complicated, and because the vibration to external environment the reason for Space Coupling is extremely sensitive, while all multicomponents being inserted into exist
Normal operation under high power be also one greatly challenge, its for measurement security there is also it is certain the problem of.
And it is to avoid disclosing a kind of base using complicated structure, the Chinese invention patent of Publication No. CN104034515B
The pattern wild effect on-line monitoring method in the high-capacity optical fiber laser of scattering optical detection, it uses all optical fibre structure
The optical fiber laser of step-refraction index profile fiber into the unstable effect of row mode measurement, it is mainly straight by photodetector
Connecing the scattering light of measurement power meter target surface, to carry out observing pattern unstable, its structure is simple compared with document 1, other extra without being inserted into
Element, and the vibration to external environment is less sensitive, has in terms of either simple in structure or system stability compared with document 1
Superiority, but there are still the safety issue measured under high power, while measure and still need multiple tune when scattering light
The position of whole photodetector can just be accurately captured scattered light signal, and this also increases the complicated of whole test system
Property.
The content of the invention
It is an object of the invention to overcome above-mentioned technical deficiency, mould in a kind of optical fiber laser based on backward light echo is proposed
The unstable observation device and method of formula, solves complicated, peace during the unstable measurement of pattern in optical fiber laser in the prior art
The low technical problem of full property.
To reach above-mentioned technical purpose, technical scheme is provided in a kind of optical fiber laser based on backward light echo
The unstable observation device of pattern, including：
Optical fiber laser, it includes sequentially connected semiconductor laser, optical-fiber bundling device, high reflectance grating, active
Yb dosed optical fiber, antiradar reflectivity coupling output grating, Cladding Power Stripper, end caps, the signal arm of the optical-fiber bundling device
Input optical fibre distal end faces cut to form an inclined-plane, the inclined-plane and between the plane of signal arm input optical fibre formed with
One cutting angle；
Signal processing mechanism, it includes one and is right against the bevelled signal arm input optical fibre of cutting and for will be anti-by inclined-plane
The optical signal penetrated is converted to photodetector and an oscillography for the electric signal to be converted to picture signal for electric signal
Device.
Meanwhile the present invention also provides the unstable observational technique of pattern in a kind of optical fiber laser based on backward light echo, bag
Include following steps：
S1, obtain optical fiber laser end caps reflected light part retroeflection optical signal；
S2, be converted to electric signal by the retroeflection optical signal of acquisition and be processed into picture signal；
S3, according to picture signal judge whether electric signal is DC level signal, if DC level signal, then the optical fiber
The non-emergence pattern of laser is unstable, and otherwise emergence pattern is unstable.
Compared with prior art, the present invention uses all optical fibre structure, its sensitivity to external mechanical vibrations is smaller, swashs
Light is all transmitted except output in fibre-optic waveguide, and additional space coupled apparatus is not required in it, reduces the complexity of observation
And danger, and observed using the relatively low retroreflection light of retroeflection power, it is easy to adjust, degree of danger is low.
Brief description of the drawings
Fig. 1 is that the connection structure of the unstable observation device of pattern in the optical fiber laser based on backward light echo of the invention is shown
It is intended to；
Fig. 2 is the cutting schematic diagram of the signal arm input optical fibre of the optical-fiber bundling device of the present invention；
Fig. 3 is the picture output signal of oscillograph when non-emergence pattern is unstable；
Fig. 4 is the picture output signal of oscillograph when emergence pattern is unstable.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Referring to Fig. 1, the present invention provides a kind of unstable observation dress of pattern in optical fiber laser based on backward light echo
Put, it includes optical fiber laser 1 and signal processing mechanism 2.
As shown in Figure 1 and Figure 2, the optical fiber laser 1 of the present embodiment includes sequentially connected semiconductor laser 11, optical fiber
Bundling device 12, high reflectance grating 13, active Yb dosed optical fiber 14, antiradar reflectivity coupling output grating 15, Cladding Power Stripper
16th, end caps 17,121 terminal edge of input optical fibre of the optical-fiber bundling device 12 is along 121 outside diameter augment direction of input optical fibre
Light penetration surface 121a is penetrated in cutting once；Semiconductor laser 11 is connected with the input optical fibre 121 of optical-fiber bundling device 12, and its is defeated
Go out optical fiber 122 to be then connected with high reflectance grating 13, active 14 both ends of Yb dosed optical fiber respectively with high reflectance grating 13 and low anti-
Penetrate rate coupling output grating 15 to connect, the output terminal of antiradar reflectivity coupling output grating 15 then passes through passive energy-transmission optic fibre and covering
Power stripper 16 connects, and end caps 17 are then connected with Cladding Power Stripper 16 using usual manner, it forms chamber always
Oscillation mode optical fiber laser 1.
As shown in Fig. 2, 121 distal end faces of signal arm input optical fibre of the optical-fiber bundling device 12 cut to form an inclined-plane
121a, the inclined-plane 121a and between the plane of signal arm input optical fibre 121 formed with a cutting angle ф, it is above-mentioned to cut
Cut angle ф and can inhibit the intensity of retroreflection light backward, and then avoid the damage of follow-up measuring apparatus, cutting angle ф is generally 0
~8 °, it preferably uses 3 ° with more preferable retroeflection luminous intensity inhibition, wherein the cutting angle ф of the present embodiment.
When above-mentioned optical fiber laser 1 specifically acts on, the optical signal of the output of semiconductor laser 11 of hectowatt grade output power
Successively by optical-fiber bundling device 12, high reflectance grating 13, active Yb dosed optical fiber 14, antiradar reflectivity coupling output grating 15, bag
Layer power stripper 16, and mirror-reflection occurs in end caps 17, the optical signal after reflection passes through Cladding Power Stripper
16th, antiradar reflectivity coupling output grating 15, active Yb dosed optical fiber 14, high reflectance grating 13, which part optical signal enter light
The signal arm input optical fibre 121 of fine bundling device 12 is simultaneously reflected by above-mentioned inclined-plane 121a and gone out.Wherein, the high reflectance of the present embodiment
Grating 13 refers to the reflecting grating that reflectivity is more than 99%, and the reflectivity that then refers to of antiradar reflectivity coupling output grating 15 is
10% or so reflecting grating, such as 9%, 10% and 11%.
Signal processing mechanism 2, which includes it, to be included one and is right against being cut with the signal arm input optical fibre 121 of inclined-plane 121a and being used in combination
It is used to turn the electric signal in the photodetector 21 and one that the optical signal reflected by inclined-plane 121a is converted to electric signal
The oscillograph 22 of picture signal is changed to, it can receive the relatively low retroeflection of the power being pierced by by inclined-plane 121a by photodetector 21
Optical signal, and electric signal input oscillograph 22 is converted, to be made whether the unstable judgement of emergence pattern.As shown in figure 3, work as
Oscillograph 22 show for DC level signal, then the 1 non-emergence pattern of optical fiber laser is unstable, as shown in figure 4, working as oscillography
Device 22 show for acutely shake oscillator signal when, then illustrate that the optical fiber laser 1 is unstable there occurs pattern.Wherein, when
When the signal that oscillograph 22 is shown occurs to vibrate by a small margin, for optical fiber laser 1, the noise of itself causes for it, can be neglected.
Moreover, when optical fiber laser 1 is unstable there occurs pattern, the cycle of its signal oscillating is millisecond magnitude.Wherein, the present embodiment
Photodetector 21 refer to that the signal receiver hole of photodetector 21 and signal arm are defeated with 121 face of signal arm input optical fibre
Enter optical fiber 121 to align or deviate smaller angle, i.e. the extending direction of signal receiver hole and signal arm input optical fibre 121 is coaxial or tool
There is smaller angle, be preferred in order to receive the part retroreflection light reflected by inclined-plane 121a, it can minimize acquisition with relatively low strong
The retroreflection light of degree, and then avoid photodetector 21 from damaging.
In order to avoid the power of retroreflection light is higher and causes device failure, signal processing mechanism 2 also wraps described in the present embodiment
An optical splitter 23 being arranged between the optical-fiber bundling device 12 and photodetector 21 is included, it, which can be reduced, is emitted directly toward photoelectricity spy
Survey the luminous power of device 21.Wherein, the bandwidth of the photodetector 21 is located at order of megahertz.
Optical-fiber bundling device 12 described in the present embodiment preferably uses (6+1) * 1 structure, it passes through six roots of sensation multimode fibre and one
After single mode optical fiber fused biconical taper composition is welded together with a doubly clad optical fiber.Active Yb dosed optical fiber 14 described in the present embodiment
Length is 10~30m.
Meanwhile the present invention also provides the unstable observational technique of pattern in a kind of optical fiber laser 1 based on backward light echo, bag
Include following steps：
S1, obtain optical fiber laser 1 17 reflected light of end caps part retroeflection optical signal, it can specifically use existing
Conventional method, also can be by the way of the present embodiment be described above；
S2, be converted to electric signal by the retroeflection optical signal of acquisition and be processed into picture signal；
S3, according to picture signal judge whether electric signal is DC level signal, if DC level signal, then the optical fiber
1 non-emergence pattern of laser is unstable, and otherwise emergence pattern is unstable.
As shown in figure 3, what is shown when oscillograph 22 is DC level signal, then the 1 non-emergence pattern of optical fiber laser is not
Stablize, as shown in figure 4, when oscillograph 22 show for acutely shake oscillator signal when, then illustrate that the optical fiber laser 1 occurs
Pattern is unstable.Wherein, when the signal that oscillograph 22 is shown occurs to vibrate by a small margin, it is optical fiber laser 1 itself
Noise causes, it is believed that it is DC level signal.
Compared with prior art, the present invention uses all optical fibre structure, its sensitivity to external mechanical vibrations is smaller, swashs
Light is all transmitted except output in fibre-optic waveguide, and additional space coupled apparatus is not required in it, reduces the complexity of observation
And danger, and observed using the relatively low retroreflection light of retroeflection power, it is easy to adjust, degree of danger is low.
The embodiment of present invention described above, is not intended to limit the scope of the present invention..Any basis
The various other corresponding changes and deformation that the technical concept of the present invention is made, should be included in the guarantor of the claims in the present invention
In the range of shield.
Claims (7)
- A kind of 1. unstable observation device of pattern in optical fiber laser based on backward light echo, it is characterised in that including：Optical fiber laser, it includes sequentially connected semiconductor laser, optical-fiber bundling device, high reflectance grating, active mixes ytterbium Optical fiber, antiradar reflectivity coupling output grating, Cladding Power Stripper, end caps, the signal arm input of the optical-fiber bundling device Optical fiber connector ends cutting formed an inclined-plane, the inclined-plane and between the plane of signal arm input optical fibre formed with all Cut angle；Signal processing mechanism, it includes one and is right against the bevelled signal arm input optical fibre of cutting and for by by slant reflection Optical signal is converted to the photodetector and an oscillograph for the electric signal to be converted to picture signal of electric signal.
- 2. the unstable observation device of pattern, its feature in the optical fiber laser according to claim 1 based on backward light echo It is, the signal processing mechanism further includes an optical splitter being arranged between the optical-fiber bundling device and photodetector.
- 3. the unstable observation device of pattern in the optical fiber laser according to claim 1 or 2 based on backward light echo, it is special Sign is that the cutting angle is 0~8 °.
- 4. the unstable observation device of pattern, its feature in the optical fiber laser according to claim 3 based on backward light echo It is, the optical-fiber bundling device is (6+1) * 1 structure.
- 5. the unstable observation device of pattern, its feature in the optical fiber laser according to claim 4 based on backward light echo It is, the length of the active Yb dosed optical fiber is 10~30m.
- 6. the unstable observation device of pattern, its feature in the optical fiber laser according to claim 5 based on backward light echo It is, the bandwidth of the photodetector is located at order of megahertz.
- 7. the unstable observational technique of pattern in a kind of optical fiber laser based on backward light echo, it is characterised in that including following step Suddenly：S1, obtain optical fiber laser end caps reflected light part retroeflection optical signal；S2, be converted to electric signal by the retroeflection optical signal of acquisition and be processed into picture signal；S3, according to picture signal judge whether electric signal is DC level signal, if DC level signal, then the optical-fiber laser The non-emergence pattern of device is unstable, and otherwise emergence pattern is unstable.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711090331.9A CN107968310A (en) | 2017-11-08 | 2017-11-08 | The unstable observation device and method of pattern in optical fiber laser based on backward light echo |
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| CN201711090331.9A CN107968310A (en) | 2017-11-08 | 2017-11-08 | The unstable observation device and method of pattern in optical fiber laser based on backward light echo |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110455495A (en) * | 2019-07-31 | 2019-11-15 | 华中科技大学鄂州工业技术研究院 | A kind of optical fiber laser mode stability detection device and method |
| CN112701557A (en) * | 2019-10-22 | 2021-04-23 | 朗美通经营有限责任公司 | Optical amplifier |
| US20210265801A1 (en) * | 2020-02-26 | 2021-08-26 | Lumentum Operations Llc | In-fiber retroreflector |
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| CN203838378U (en) * | 2014-04-16 | 2014-09-17 | 武汉电信器件有限公司 | Multichannel parallel optical assembly with backlight monitoring |
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| CN104836099A (en) * | 2015-05-19 | 2015-08-12 | 大族激光科技产业集团股份有限公司 | Optical fiber laser system and monitoring device thereof |
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| CN105700089A (en) * | 2016-04-14 | 2016-06-22 | 武汉耀晟互连科技有限公司 | Fiber array coupling assembly with power monitoring function and manufacturing method thereof |
| CN105790060A (en) * | 2014-12-23 | 2016-07-20 | 山东海富光子科技股份有限公司 | Linear polarization all-fiber laser based on distributed Bragg fiber gratings |
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| US20090213363A1 (en) * | 2008-02-27 | 2009-08-27 | Dmitry Starodubov | Power monitoring device for powerful fiber laser systems |
| CN104466630A (en) * | 2013-09-12 | 2015-03-25 | 中国兵器装备研究院 | High-power fiber laser |
| CN203838378U (en) * | 2014-04-16 | 2014-09-17 | 武汉电信器件有限公司 | Multichannel parallel optical assembly with backlight monitoring |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110455495A (en) * | 2019-07-31 | 2019-11-15 | 华中科技大学鄂州工业技术研究院 | A kind of optical fiber laser mode stability detection device and method |
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| CN112701557A (en) * | 2019-10-22 | 2021-04-23 | 朗美通经营有限责任公司 | Optical amplifier |
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Application publication date: 20180427 |